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LMR38025

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80V input, 2.5A synchronous step-down (buck) DC/DC converter with spread spectrum

Product details

Vin (min) (V) 4.2 Vin (max) (V) 80 Vout (min) (V) 1 Vout (max) (V) 75 Iout (max) (A) 2.5 Iq (typ) (mA) 0.04 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 EMI features Spread Spectrum Features Enable, Forced PWM, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, UVLO Fixed Operating temperature range (°C) -40 to 150 Rating Catalog TI functional safety category Functional Safety-Capable Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 98 Type Converter
Vin (min) (V) 4.2 Vin (max) (V) 80 Vout (min) (V) 1 Vout (max) (V) 75 Iout (max) (A) 2.5 Iq (typ) (mA) 0.04 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 EMI features Spread Spectrum Features Enable, Forced PWM, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, UVLO Fixed Operating temperature range (°C) -40 to 150 Rating Catalog TI functional safety category Functional Safety-Capable Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 98 Type Converter
WSON (DRR) 12 9 mm² 3 x 3
  • Functional Safety-Capable
  • Configured for rugged industrial applications
    • 4.2V to 80V input voltage range
    • 2.5A continuous output current
    • Ultra-low 40µA operating quiescent current
    • 200kHz to 2.2MHz adjustable switching frequency
    • Frequency synchronization to external clock
    • 97% maximum duty cycle
    • Supports start-up events with prebiased output
    • ±1.5% reference voltage tolerance over temperature
    • Precision enable
    • Easy to use with integrated compensation network enabling low BOM count
    • Integrated synchronous rectification
    • 12-pin WSON wettable flank with PowerPAD™ integrated circuit package
    • PFM and forced PWM (FPWM) options
    • Spread Spectrum option available
  • Create a custom design using the LMR38025 with the WEBENCH Power Designer
  • Functional Safety-Capable
  • Configured for rugged industrial applications
    • 4.2V to 80V input voltage range
    • 2.5A continuous output current
    • Ultra-low 40µA operating quiescent current
    • 200kHz to 2.2MHz adjustable switching frequency
    • Frequency synchronization to external clock
    • 97% maximum duty cycle
    • Supports start-up events with prebiased output
    • ±1.5% reference voltage tolerance over temperature
    • Precision enable
    • Easy to use with integrated compensation network enabling low BOM count
    • Integrated synchronous rectification
    • 12-pin WSON wettable flank with PowerPAD™ integrated circuit package
    • PFM and forced PWM (FPWM) options
    • Spread Spectrum option available
  • Create a custom design using the LMR38025 with the WEBENCH Power Designer

The LMR38025 synchronous buck converter is designed to regulate over a wide input voltage range, minimizing the need for external surge suppression components. The LMR38025 operates during input voltage dips as low as 4.2V, at nearly 100% duty cycle if needed, making the device an excellent choice for wide input industrial applications and MHEV/EV systems as the absolute maximum input voltage is 85V.

The LMR38025 features a high voltage enable pin to enable the device by connecting the device to the wide input supply voltage or by having precise UVLO control across start-up and shutdown. The power-good flag, with built-in filtering and delay, offers a true indication of system status, eliminating the need for an external supervisor. The device incorporates pseudorandom spread spectrum option for minimal EMI. The switching frequency can be configured between 200kHz and 2.2MHz to avoid noise sensitive frequency bands. In addition, the frequency can be programmed through the RT pin for improved efficiency at low operating frequencies or by having a smaller design size at high operating frequencies.

The device has built-in protection features such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation. The LMR38025 is available in a 12-pin WSON package.

The LMR38025 synchronous buck converter is designed to regulate over a wide input voltage range, minimizing the need for external surge suppression components. The LMR38025 operates during input voltage dips as low as 4.2V, at nearly 100% duty cycle if needed, making the device an excellent choice for wide input industrial applications and MHEV/EV systems as the absolute maximum input voltage is 85V.

The LMR38025 features a high voltage enable pin to enable the device by connecting the device to the wide input supply voltage or by having precise UVLO control across start-up and shutdown. The power-good flag, with built-in filtering and delay, offers a true indication of system status, eliminating the need for an external supervisor. The device incorporates pseudorandom spread spectrum option for minimal EMI. The switching frequency can be configured between 200kHz and 2.2MHz to avoid noise sensitive frequency bands. In addition, the frequency can be programmed through the RT pin for improved efficiency at low operating frequencies or by having a smaller design size at high operating frequencies.

The device has built-in protection features such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation. The LMR38025 is available in a 12-pin WSON package.

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Technical documentation

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Type Title Date
* Data sheet LMR38025 SIMPLE SWITCHER Power Converter, 4.2V to 80V, 2.5A , Synchronous Buck Converter With 40µA IQ datasheet PDF | HTML 02 Feb 2024
Functional safety information LMR38015, LMR38025 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 07 Feb 2024

Design & development

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Evaluation board

LMR38025QEVM — LMR38025-Q1 evaluation module for 4.2-V to 80-V, synchronous buck SIMPLE SWITCHER® power converter

User guide: PDF | HTML
Not available on TI.com
Simulation model

LMR38025F-Q1 PSpice Transient Model

SNVMCC6.ZIP (373 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Package Pins Download
WSON (DRR) 12 View options

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